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We present a study of He-like 1s2-1s2p line emission from solid and low-density Ti targets under 45 fs laser pulse irradiation with a frequency doubled Ti:Sapphire laser. By varying the beam spot, the intensity on target was varied from 1015 W/cm2 to 1019 W/cm2. At best focus, low density "smoked" Ti targets yield ~ 20 times more He-α than the foil targets when irradiated at an angle of 45° with s-polarized pulses. The duration of He-α emission from smoked targets, measured with a fast streak camera, was similar to that from Ti foils.

Enhanced He-α emission from “smoked” Ti targets irradiated with 400 nm, 45 fs laser pulses